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having an error return value makes the interface a bit confusing to
use. Just ponder... What would an error returned from a predicate
function mean?

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>

dht doesn't need the whole network interface, only needs a Dialer.
(much reduced surface of possible errors)

![](http://m.memegen.com/77n7dk.jpg)

new Service interface

@perfmode sender is exactly what we need to pass in to dht/bitswap.